Steam-engine



No. 466,799. Patented Jan. 12, 18921.

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J. M. POWELL.

STEAM ENGINE.

No. 496,799. Patented Jan. 12, 1892.

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JOSEPH M. IOVELI., OF SPRINGFIELD, MISSOURI.

STEAM-ENGINE.

SPECIFICATION forming part of Letters Patent No. 466,799, dated January12, 1892.

Application filed September 7, 1891. Serial No. 405,037. (No model.)

To @ZZ whom it may concern:

Be it known that I, JOSEPH M. POWELL, a citizen of the United States,residing at Springiield, in the county ot' Greenel and State ofMissouri, have invented certain new and useful Improvements in AutomaticSteamEn 4 gines; and I do hereby declare the following` to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention consists Vof improvements in automatic steam-engines, theobject of which is to provide a cheap, simple, and durable steam-chestcut-off and valve. These objects I attain by means of the devicehereinafter particularly described and claimed, and illustrated in theaccompanying drawings, forming a part of this specitication, in which-Figure l is a view in elevation of the entire device. Fig. 2 is avertical longitudinal section of the cylinder and steam-chests. Fig. 3is the bonnet or cap on the end of the steamchest. Fig. 4: is a view ofthe sides of the steam-chest and exhaust-valve seat. Fig. 5 is a view ofthe plate which forms the cylinder-head, showing the ports into the endof the cylinder` with the valves, also the openings for the steam toenter the steam-chest. Fig. G is a detailed view,enlarged,to show themechanism for operating the valves.

Similar letters of reference indicate corresponding parts in the severalfigures.

A is an ordinary cylinder.

B B are the steam-passages.

C are the steam-chests on the ends of the cylinder. The steam-chests areformed ofthe bonnet or cap D, the cylinder-head F, and thepiece E, whichforms the sides of the steamchest and has a dividing-partition E2. Saidpartition divides the steam from the exhaust. In the exhaust part of thechest avalve-seat is formed with a plate X, having a projecting ridge orrim X2, and a port K3, corresponding with the port in the cylinder-head.Thus the exhaust-valve G works between two ports K2 and K3 to lessen theamount of clearancespace, so that the clearance-space of both thesupply-valve I-I and exhaust-valve G is only the thickness of thecylinder-head. Valve H for the supply has a balance-valve I, having `byadjusting the valve-seat I2.

a seat I2 to lessen the friction ot the valve H. Said balance-valveconsists of two plates-an inner plate I2, forming the seat for the valveII, and the outer plate I3. Said plates are connected by stud-bolts I4for holding the plates in any given position relative to each other,passing through the bonnetplate D, and plate I3 is provided with an adjListing-screw I5 for raising and lowering the plate I3, there- This Iaccomplish by means of screw-threads in the bonnet D, and on the end ofvthe adjustable screw I5 the other end of the said screw has shouldersor projections I( on each side of the plate I3, thus forming a swivel,so that the plate I3 will have to rise or fall as the screw I5 isturned.

The ports to the supply K and exhaust K2 are made long, and preferablywith sides formed in the shape of an arc of a circle, or nearly crescentshape, and connect with elongated steam passage-ways .B B2. The valvesI-l and G are made curved to lit and slide back and forth over theports, and for this purpose are provided with self-packin g fulcrums L,which move back and forth. Forthis purpose the side piece E is providedwith openings E3 to receive the fulcru ms L and. slots E4 E5 to permitthe valve-stems to work back and forth.

The end of the cylinder through which the piston-rods pass is provided'with a steamchest which has a collar M, which may be made in two ormore pieces, so that it maybe removed to get at the valves withoutremoving any other machinery.

The valves H and G are operated automatically thus: By means of anordinary eccentric-rod on the main shaft I connect with the wrist N onthe Working beam or lever O. Said lever O is connected by means of anadjustable valve-rod P, having pivoted or swivel connections with thelower or exhaust valve stem S2, so as to move smoothly back and forth.The valve-stem lflgof the supply-valve is connected with a dashpot orother suitable device for closing the valve, the said valve being openedbythe upper or back stroke of the lever O. The valve would be closed bythe lever O moving in the opposite direction, provided it were notsooner tripped. I trip it in IOO any suitable Way by connection with thegovernor, which is so adjusted as to cut ott the supply when the desiredspeed is reached at each stroke of the piston. This I accomplish byproviding a bolt Q in the end of the lever O, Which is provided with ashoulder Q2 and a spring Q3 for holding the bolt forward and is hingedto a trip-lever R, said lever having a beveled end R2, against which aspiral piece S Operates to push the end of the lever R and push back thebolt Q, thus tripping the valve H. Bolt Q is placed in a slot in thelever Q and inclosed by a suitable plate T, which is riveted or boltedin place. The spiral piece S is placed upon a rocking shaft W, which isoperated by an arm W2, attached to a lift-rod orspindle of the governor.The rocking shaft W has suitable bearings connected to the cylinder orsteam-chests.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. A steam-chest on each end ot' a cylinder,

v formed of bonnet D, cylinder-head F, and

sides E, the chests being divided and provided with curved elongatedports K K2, combined with curved slide-valves G and II, substantially asshown and described.

2. In an engine, the combination of a selfpacking fulcrum L on aslide-valve secured to the end of the cylinder and a balance-valve Iwith steam-chest C on the ends of the cylinder, substantially as shownand described.

In an engine, the exhaust-valve chest on -the end of the cylinder, incombination with a curved slide-valve having a self-packing fulcrum, aseat-piece X, having a port X2 to correspond with the port K2, and achest C on the end of the cylinder, having a partition E2 and asteam-passage B2, all substantially as shown and described.

4. A supply-valve for a cylinder, consisting of -a curved valve H,having a self-packing fulcrum for sliding over a curved port inthe endof the cylinder, combined With a cylinder A, and a steam-chest C, and abalancevalve I, all substantially as shown and described.

5. The combination of a sliding valve H, having a self-packing fulcrumand a steamcheston the end of a cylinder, Wit-h a balancevalveconsisting of two plates I2 I2, stud-bolts I4, and an adjustable screwI5, having shoulders I6, all substantially as and for the purposespecified.

G. In combination With sliding valves having self-packing fulcruins, themechanism for operating them, consisting of an eccentric-rod foroperating a Working lever 0, Which is attached to the valve-stem of theexhaust-valve G and opens the supply-valve by means Ot' a sliding bolt Qand closes the supply-valve by a dash-pot tripped by a spiral piece S,operating on a pivoted lever R, all substantially as shown anddescribed. 7. A device for tripping the supply-valve, consisting of abolt Q, having a spring Q3 and lever R, and a spiral piece S, attachedto a rocking shaft W, which is connected to the governor ofthe engine,combined with a lever O, having a slot and a plate T, all substantiallyas and for the purpose specified.

In testimony whereof Iafiix my signature in presence of two witnesses.

JOSEPH INI. POWELL.

Witnesses:

S. A. HASELTLNE, B. L. FERRIS.

